globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85061344071
论文题名:
Towards understanding the suppressed ENSO activity during mid-Holocene in PMIP2 and PMIP3 simulations
作者: Chen L.; Zheng W.; Braconnot P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
语种: 英语
英文关键词: Air-sea feedback ; BJ index ; ENSO amplitude change in mid-Holocene ; Meridional structure change ; Ocean dynamical processes
英文摘要: The mechanisms of El Niño–Southern Oscillation (ENSO) variability change during the mid-Holocene (MH) were investigated through analyzing the model simulations from the Paleoclimate Modelling Intercomparison Project Phases (PMIP) phase-2 and phase-3. The majority of PMIP2 and PMIP3 model simulations show a lower level of ENSO activity in the MH simulation compared to the pre-industrial (PI) simulation, which is qualitatively consistent with that inferred from the paleoclimate proxies. Through employing the Bjerknes stability index, we quantified the dynamic and thermodynamic air-sea feedbacks in the PI and MH simulations. The quantitative analyses showed that the reduced ENSO variability in MH arose from the weakening in the thermocline (TH), zonal-advection (ZA) and Ekman (EK) feedback terms. We found that all the weakened TH, ZA, and EK terms are associated with the reduction in the response of anomalous thermocline depth (Dʹ) to the zonal wind stress anomaly (τx′) in MH compared to PI. The reduced Dʹ response is attributed to the flattened meridional structure of ENSO-related τx′ field in MH, which is linked to the enhanced surface poleward mean meridional current in MH. Among many aspects of the mean state changes under the MH orbital forcing, this study identified that the surface mean meridional current change might be a key factor behind the suppressed ENSO variability in MH. Lastly, through comparing our findings with the ENSO future projection studies, we found that the wind-thermocline feedback is susceptible in a changing climate, which implies that minimizing the uncertainty in the wind-thermocline feedback change may help constrain future ENSO response. © 2019, The Author(s).
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122541
Appears in Collections:气候变化事实与影响

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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, 210044, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; State Key Laboratory of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xian, 710061, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, bât. 714, Gif-sur-Yvette, 91191, France

Recommended Citation:
Chen L.,Zheng W.,Braconnot P.. Towards understanding the suppressed ENSO activity during mid-Holocene in PMIP2 and PMIP3 simulations[J]. Climate Dynamics,2019-01-01
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